Reducing-valve.



No. 799,723. PATENTED SEPT. 19, 1905- DEWRANOE & G. H. WALL.

REDUCING VALVE.

APPLICATION FILED 00124. 1904.

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WITNESSES. INVENTORSI 'No. 799,723. PATENTBD SEPT. 19, 1905/ J. DEWRANCB& e. H. WALL. REDUCING VALVE.

APPLICATION FILED 001..24. 1904.

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APPLICATION I'ILED OCT. 24. 1904.

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N0. 799,723. PATBNTED SEPT. 19, 1905.

J. DEWRANGE & G, H. WALL.

REDUCING VALVE.

APPLICATION FILED 001'. 24. 1904.

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UNITED srngrns PATENT oFFIoE.

JOHN DEWRANCE AND GEORGE HENRY WALL, OF SOUTHWARK, ENGLAND.

' REDUCING-VALVE.

Specification of Letters Patent.

Patented Sept. 19, 1905.

Application filed October 24,1904. Serial No. 229,831.

To [I/ZZ 1071,0171 it nuty concern.-

.Be it known that we, J OHN-DEWRANOE and GEORGE HENRY WALL, of 165 GreatDover street, Southwark, in the county of Surrey, England, subjects ofthe King of Great Britain and Ireland, have invented certain new anduseful Improvements in Reducing-Valves, of which the following is aspecification.

This invention relates to valves for regulating the discharge of afluidof any given initial pressure (which may be variable) in such a manneras to automatically restrict the pressure of the discharge to somepredetermined reduced pressure.

In the accompanying drawings, Figures 1 and 2 illustrate areducing-valve embodying our improvements, Fig. 1 being a verticalsection and Fig. 2 a side elevation with certain parts in section. Fig.3 is a vertical section of the valve-casing on a plane at right anglesto that employed in Fig. 1. Fig. A is a view similar to Fig. 3,illustrating a modification hereinafter more particularly referred to.

According to our invention, the main valve A for controlling the passageof the fluid is of the equilibrium type, and consists of two diskshapedheads a (0*, arranged at a suitable distance apart and either formedintegrally with the valve stem or body a or rigidly attached thereto.Each head is preferably formed or provided with wings (0 which work inseatings or cut-olf rings a and serve as guides. The seatings or cut-offrings a a are maintained at a suitable distance apart by means of arms awhich constitute a skeleton frame. The heads a (6* of the valve arelarger in diameter than the bore of the seatings, so that the formertake a bearing upon the faces of the latter. In order to admit of theparts being assembled, one of the seatings a is formed as a loose ring,and one of the heads a* is secured or otherwise attached to the valveetc or body. I

The fluid the pressure of which is to be reduced is admitted by way ofopenings a between the two heads a (0*, and when the valve A is open, asshown in Figs. 1 and 3, escapes in opposite directions between a (0* andtheir respective cut-off rings or seatings a a.

The valve A is connected, by means ofa stem 6/, to the long arm I) of alever B, preferably of the first order, the said stem and lever beinginclosed within a casing 12. The opposite or short arm 6* ofthe lever isconnected, by means of a rod 0, to a flexible diaphragm C, whereof theupper side is inclosed within a casing 0, attached to the cover a of themainvalve casing, while the lower side is supported upon a piston D.This piston is carried by a nut 0 applied to the lower end of thespindle c,'the extremity of the latter resting upon a yoke d, the endsof which engage with suspending-rods d d, borne by spiral or othersuitable springs d W. The pressure of the springs d although capable ofvariation for purposes of adjustment, are normally capable of exercisinga resistance equivalent to the pressure of the fluid acting on theinclosed face of the diaphragm C. Under such circumstances both the mainvalve A and the diaphragm C are respectively in equilibrium; but therespective movements of these two parts vary in the ratio of the lengthsof the two arms 6 6* of the lever B, to which they are severallyattached. Thus the movement of the valve A may be considerable, so as toafford a full-way passage for the fluid, while the movement of thediaphragm C is relatively small and admits of nearly the whole of itsarea being constantly borne by the springsupported piston D. Owing,moreover, to the small extent of the movement of the diaphragm, thepressure exerted by the springs d (Z remains practically constant.- Itwill be obvious that the design may be modified in ,such a manner as toadmit of the pressure on the diaphragm C being counterbalanced by meansof weights instead of springs.

When a valve of the equilibrium type, such as above referred to, isemployed, the initial pressure is admitted between the heads a (0*thereof, passes to the reducedpressure side, and, entering the casing Z)by way of the passage Z2 ,..surrounding the valve-stem a finds its wayto the inclosed face of the diaphragm O. Upon the reduced pressurebecoming so far augmented as to exceed the load on the spring-supporteddiaphragm the latter is de flected, with the effect that the main valveA is partially or wholly closed.

It will be obvious that the apparatus de- Joo scribed may be madeapplicable for use as a surplus valve by transposing the inlet andoutlet and inverting the valve with its seatings.

' Among other advantages resulting fromthe construction described thechamber in which the diaphragm is mounted remains comparatively cool,its distance from the valve-chamber being such that the transmission ofheat by conduction is for the most part prevented. Moreover, thediaphragmchamber is not liable to collect dirt or sediment. It remainscharged with the water of condensation and is only exposed to thereduced as distinguished from the initial pressure of the steam. Anysudden movement of the diaphragm, and consequently of the valve, isavoid ed by reason of the diaphragmchamber being; nearly closed, thuspreventing' the rapid discharge of the water of condensation. I

What we claim as our invention, and desire to secure by Letters Patent,is

1. In a reducing-valve, the combination with a main controlling-valve ofthe equilibrium type, having two heads of equal diameter, and cut-ofirings whereon the heads respectively seat, of a rocking-lever connectedas to one arm with the said valve and as to the other arm with areacting diaphragm;

JOHN DEWRANGE. GEORGE HENRY WVALL.

Witnesses:

H. D. J AMESON, F. L. RAND.

